2006 YAMAHA WR 250F engine

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Page 230 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 23
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COOLANT REPLACEMENT
WARNING
Do not remove the radiator cap
when the engine is hot.
CAUTION:
Take care so that coolant does not
splash on painted surfaces. If it
splashes, wash it away

Page 232 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 25
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9. Fill:
Radiator
Engine
To specified level.
CAUTION:
Do not mix more than one type
of ethylene glycol antifreeze
containing corrosion inhibitors
for aluminum engine.
Do not use wa

Page 234 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 27
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12. Install:
Coolant reservoir cap
13. Start the engine and let it warm
up for several minutes.
14. Turn off the engine and inspect
the coolant level.
Refer to “COOLANT LEVEL
INSPEC

Page 236 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 29
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3. Inspect:
Pressure
Impossible to maintain the
specified pressure for 10 sec-
onds 
→ Replace.
COOLING SYSTEM INSPECTION
1. Inspect:
Coolant level
2. Attach:
Radiator cap tester

Page 238 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 31
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2. Adjust:
Clutch lever free play
NOTE:Make minute adjustment on the
lever side using the adjuster 
2.
After adjustment, check proper
operation of clutch lever. Clutch lever free pl

Page 240 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 33
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THROTTLE LUBRICATION
1. Remove:
Cover (throttle cable cap) 
1 
Cover (grip cap) 
2 
Throttle grip cap 
3 
2. Apply:
Lithium soap base grease
On the throttle cable end 
a.
3. Instal

Page 242 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 35
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AIR FILTER CLEANING
NOTE:Proper air filter maintenance is the
biggest key to preventing premature
engine wear and damage.
CAUTION:
Never run the engine without the
air filter element i

Page 244 of 900

YAMAHA WR 250F 2006  Owners Manual 3 - 37
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5. Inspect:
Air filter element
Damage 
→ Replace.
6. Apply:
Foam-air-filter oil or equivalent
oil to the element
NOTE:Squeeze out the excess oil. Ele-
ment should be wet but not d